As expected, coming in a range of materials means that there is extensive flexibility with respect to colour choice. Throughout their history the Moon Boot has always been a bright and happy addition to any winter wardrobe and now is no different. Colour examples include neutral and subtle tones such as ochre, grey, dark brown, black and ice through to light pink, violet, azure, petrol blue, orange and sea green. More conspicuous colours consist of silver, ivory, burgundy, bouganville, apricot, red and yellow especially since some also come in a metallic finish.

The very productive Cassini mission might attain some indirect information by analyzing the ring arc material--however, it is unlikely to come close to the little moon again before the mission ends in 2017.

However, the models become somewhat more complicated when different forms of ice are taken into consideration. The ice floating around in a glass of water is termed Ice I. Ice I is the least dense form of ice, and it is lighter than water. However, at high pressures, like those that exist in crushingly deep subsurface oceans like Ganymede's, the ice crystal structures evolve into something considerably more compact. "It's like finding a better arrangement of shoes in your luggage--the ice molecules become packed together more tightly," Dr. Vance said in his May 1, 2014 statement. Indeed, the ice can become so extremely dense that it is actually heavier than water--and therefore somersaults down to the bottom of the sea. The heaviest, densiest ice of all is believed to exist within Ganymede, and it is called Ice VI.